diff mbox series

[v2] PCI: mvebu: Fix duplicate resource requests

Message ID 20201023145252.2691779-1-robh@kernel.org
State Accepted
Headers show
Series [v2] PCI: mvebu: Fix duplicate resource requests | expand

Commit Message

Rob Herring Oct. 23, 2020, 2:52 p.m. UTC
With commit 669cbc708122 ("PCI: Move DT resource setup into
devm_pci_alloc_host_bridge()"), the DT 'ranges' is parsed and populated
into resources when the host bridge is allocated. The resources are
requested as well, but that happens a 2nd time for the mvebu driver in
mvebu_pcie_parse_request_resources(). We should only be requesting the
additional resources added in mvebu_pcie_parse_request_resources().
These are not added by default because the use custom properties rather
than standard DT address translation.

Also, the bus ranges was also populated by default, so we can remove
it from mvebu_pci_host_probe().

Fixes: 669cbc708122 ("PCI: Move DT resource setup into devm_pci_alloc_host_bridge()")
Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=209729
Reported-by: vtolkm@googlemail.com
Cc: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
Cc: Jason Cooper <jason@lakedaemon.net>
Cc: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Cc: Bjorn Helgaas <bhelgaas@google.com>
Cc: Russell King <linux@armlinux.org.uk>
Cc: linux-pci@vger.kernel.org
Cc: linux-arm-kernel@lists.infradead.org
Signed-off-by: Rob Herring <robh@kernel.org>
---
v2:
 - Fix copy-n-paste error with ioport_resource
---
 drivers/pci/controller/pci-mvebu.c | 23 ++++++++++-------------
 1 file changed, 10 insertions(+), 13 deletions(-)

Comments

Jan Kundrát Oct. 26, 2020, 4:42 p.m. UTC | #1
On pátek 23. října 2020 16:52:52 CEST, Rob Herring wrote:
> With commit 669cbc708122 ("PCI: Move DT resource setup into
> devm_pci_alloc_host_bridge()"), the DT 'ranges' is parsed and populated
> into resources when the host bridge is allocated. The resources are
> requested as well, but that happens a 2nd time for the mvebu driver in
> mvebu_pcie_parse_request_resources(). We should only be requesting the
> additional resources added in mvebu_pcie_parse_request_resources().
> These are not added by default because the use custom properties rather
> than standard DT address translation.
>
> Also, the bus ranges was also populated by default, so we can remove
> it from mvebu_pci_host_probe().
>
> Fixes: 669cbc708122 ("PCI: Move DT resource setup into 
> devm_pci_alloc_host_bridge()")
> Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=209729
> Reported-by: vtolkm@googlemail.com
> Cc: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
> Cc: Jason Cooper <jason@lakedaemon.net>
> Cc: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
> Cc: Bjorn Helgaas <bhelgaas@google.com>
> Cc: Russell King <linux@armlinux.org.uk>
> Cc: linux-pci@vger.kernel.org
> Cc: linux-arm-kernel@lists.infradead.org
> Signed-off-by: Rob Herring <robh@kernel.org>

Without this patch, 5.9.1 won't find the eMMC card on Clearfog Base for me, 
so:

Tested-by: Jan Kundrát <jan.kundrat@cesnet.cz>

Thanks for the fix,
Jan
Lorenzo Pieralisi Nov. 3, 2020, 4:29 p.m. UTC | #2
On Fri, Oct 23, 2020 at 09:52:52AM -0500, Rob Herring wrote:
> With commit 669cbc708122 ("PCI: Move DT resource setup into
> devm_pci_alloc_host_bridge()"), the DT 'ranges' is parsed and populated
> into resources when the host bridge is allocated. The resources are
> requested as well, but that happens a 2nd time for the mvebu driver in
> mvebu_pcie_parse_request_resources(). We should only be requesting the
> additional resources added in mvebu_pcie_parse_request_resources().
> These are not added by default because the use custom properties rather
> than standard DT address translation.
> 
> Also, the bus ranges was also populated by default, so we can remove
> it from mvebu_pci_host_probe().
> 
> Fixes: 669cbc708122 ("PCI: Move DT resource setup into devm_pci_alloc_host_bridge()")
> Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=209729
> Reported-by: vtolkm@googlemail.com
> Cc: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
> Cc: Jason Cooper <jason@lakedaemon.net>
> Cc: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
> Cc: Bjorn Helgaas <bhelgaas@google.com>
> Cc: Russell King <linux@armlinux.org.uk>
> Cc: linux-pci@vger.kernel.org
> Cc: linux-arm-kernel@lists.infradead.org
> Signed-off-by: Rob Herring <robh@kernel.org>
> ---
> v2:
>  - Fix copy-n-paste error with ioport_resource
> ---
>  drivers/pci/controller/pci-mvebu.c | 23 ++++++++++-------------
>  1 file changed, 10 insertions(+), 13 deletions(-)

Hi Bjorn, strictly speaking, this bug was introduced in v5.9 - it would
be good to fix it in one of the upcoming -rc*:

Acked-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>

> diff --git a/drivers/pci/controller/pci-mvebu.c b/drivers/pci/controller/pci-mvebu.c
> index c39978b750ec..653c0b3d2912 100644
> --- a/drivers/pci/controller/pci-mvebu.c
> +++ b/drivers/pci/controller/pci-mvebu.c
> @@ -960,25 +960,16 @@ static void mvebu_pcie_powerdown(struct mvebu_pcie_port *port)
>  }
>  
>  /*
> - * We can't use devm_of_pci_get_host_bridge_resources() because we
> - * need to parse our special DT properties encoding the MEM and IO
> - * apertures.
> + * devm_of_pci_get_host_bridge_resources() only sets up translateable resources,
> + * so we need extra resource setup parsing our special DT properties encoding
> + * the MEM and IO apertures.
>   */
>  static int mvebu_pcie_parse_request_resources(struct mvebu_pcie *pcie)
>  {
>  	struct device *dev = &pcie->pdev->dev;
> -	struct device_node *np = dev->of_node;
>  	struct pci_host_bridge *bridge = pci_host_bridge_from_priv(pcie);
>  	int ret;
>  
> -	/* Get the bus range */
> -	ret = of_pci_parse_bus_range(np, &pcie->busn);
> -	if (ret) {
> -		dev_err(dev, "failed to parse bus-range property: %d\n", ret);
> -		return ret;
> -	}
> -	pci_add_resource(&bridge->windows, &pcie->busn);
> -
>  	/* Get the PCIe memory aperture */
>  	mvebu_mbus_get_pcie_mem_aperture(&pcie->mem);
>  	if (resource_size(&pcie->mem) == 0) {
> @@ -988,6 +979,9 @@ static int mvebu_pcie_parse_request_resources(struct mvebu_pcie *pcie)
>  
>  	pcie->mem.name = "PCI MEM";
>  	pci_add_resource(&bridge->windows, &pcie->mem);
> +	ret = devm_request_resource(dev, &iomem_resource, &pcie->mem);
> +	if (ret)
> +		return ret;
>  
>  	/* Get the PCIe IO aperture */
>  	mvebu_mbus_get_pcie_io_aperture(&pcie->io);
> @@ -1001,9 +995,12 @@ static int mvebu_pcie_parse_request_resources(struct mvebu_pcie *pcie)
>  		pcie->realio.name = "PCI I/O";
>  
>  		pci_add_resource(&bridge->windows, &pcie->realio);
> +		ret = devm_request_resource(dev, &ioport_resource, &pcie->realio);
> +		if (ret)
> +			return ret;
>  	}
>  
> -	return devm_request_pci_bus_resources(dev, &bridge->windows);
> +	return 0;
>  }
>  
>  /*
> -- 
> 2.25.1
>
Bjorn Helgaas Nov. 3, 2020, 7:32 p.m. UTC | #3
On Fri, Oct 23, 2020 at 09:52:52AM -0500, Rob Herring wrote:
> With commit 669cbc708122 ("PCI: Move DT resource setup into
> devm_pci_alloc_host_bridge()"), the DT 'ranges' is parsed and populated
> into resources when the host bridge is allocated. The resources are
> requested as well, but that happens a 2nd time for the mvebu driver in
> mvebu_pcie_parse_request_resources(). We should only be requesting the
> additional resources added in mvebu_pcie_parse_request_resources().
> These are not added by default because the use custom properties rather
> than standard DT address translation.
> 
> Also, the bus ranges was also populated by default, so we can remove
> it from mvebu_pci_host_probe().
> 
> Fixes: 669cbc708122 ("PCI: Move DT resource setup into devm_pci_alloc_host_bridge()")
> Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=209729
> Reported-by: vtolkm@googlemail.com
> Cc: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
> Cc: Jason Cooper <jason@lakedaemon.net>
> Cc: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
> Cc: Bjorn Helgaas <bhelgaas@google.com>
> Cc: Russell King <linux@armlinux.org.uk>
> Cc: linux-pci@vger.kernel.org
> Cc: linux-arm-kernel@lists.infradead.org
> Signed-off-by: Rob Herring <robh@kernel.org>

Applied with Jan's tested-by and Lorenzo's ack to for-linus for
v5.10, thanks!

> ---
> v2:
>  - Fix copy-n-paste error with ioport_resource
> ---
>  drivers/pci/controller/pci-mvebu.c | 23 ++++++++++-------------
>  1 file changed, 10 insertions(+), 13 deletions(-)
> 
> diff --git a/drivers/pci/controller/pci-mvebu.c b/drivers/pci/controller/pci-mvebu.c
> index c39978b750ec..653c0b3d2912 100644
> --- a/drivers/pci/controller/pci-mvebu.c
> +++ b/drivers/pci/controller/pci-mvebu.c
> @@ -960,25 +960,16 @@ static void mvebu_pcie_powerdown(struct mvebu_pcie_port *port)
>  }
>  
>  /*
> - * We can't use devm_of_pci_get_host_bridge_resources() because we
> - * need to parse our special DT properties encoding the MEM and IO
> - * apertures.
> + * devm_of_pci_get_host_bridge_resources() only sets up translateable resources,
> + * so we need extra resource setup parsing our special DT properties encoding
> + * the MEM and IO apertures.
>   */
>  static int mvebu_pcie_parse_request_resources(struct mvebu_pcie *pcie)
>  {
>  	struct device *dev = &pcie->pdev->dev;
> -	struct device_node *np = dev->of_node;
>  	struct pci_host_bridge *bridge = pci_host_bridge_from_priv(pcie);
>  	int ret;
>  
> -	/* Get the bus range */
> -	ret = of_pci_parse_bus_range(np, &pcie->busn);
> -	if (ret) {
> -		dev_err(dev, "failed to parse bus-range property: %d\n", ret);
> -		return ret;
> -	}
> -	pci_add_resource(&bridge->windows, &pcie->busn);
> -
>  	/* Get the PCIe memory aperture */
>  	mvebu_mbus_get_pcie_mem_aperture(&pcie->mem);
>  	if (resource_size(&pcie->mem) == 0) {
> @@ -988,6 +979,9 @@ static int mvebu_pcie_parse_request_resources(struct mvebu_pcie *pcie)
>  
>  	pcie->mem.name = "PCI MEM";
>  	pci_add_resource(&bridge->windows, &pcie->mem);
> +	ret = devm_request_resource(dev, &iomem_resource, &pcie->mem);
> +	if (ret)
> +		return ret;
>  
>  	/* Get the PCIe IO aperture */
>  	mvebu_mbus_get_pcie_io_aperture(&pcie->io);
> @@ -1001,9 +995,12 @@ static int mvebu_pcie_parse_request_resources(struct mvebu_pcie *pcie)
>  		pcie->realio.name = "PCI I/O";
>  
>  		pci_add_resource(&bridge->windows, &pcie->realio);
> +		ret = devm_request_resource(dev, &ioport_resource, &pcie->realio);
> +		if (ret)
> +			return ret;
>  	}
>  
> -	return devm_request_pci_bus_resources(dev, &bridge->windows);
> +	return 0;
>  }
>  
>  /*
> -- 
> 2.25.1
> 
> 
> _______________________________________________
> linux-arm-kernel mailing list
> linux-arm-kernel@lists.infradead.org
> http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
diff mbox series

Patch

diff --git a/drivers/pci/controller/pci-mvebu.c b/drivers/pci/controller/pci-mvebu.c
index c39978b750ec..653c0b3d2912 100644
--- a/drivers/pci/controller/pci-mvebu.c
+++ b/drivers/pci/controller/pci-mvebu.c
@@ -960,25 +960,16 @@  static void mvebu_pcie_powerdown(struct mvebu_pcie_port *port)
 }
 
 /*
- * We can't use devm_of_pci_get_host_bridge_resources() because we
- * need to parse our special DT properties encoding the MEM and IO
- * apertures.
+ * devm_of_pci_get_host_bridge_resources() only sets up translateable resources,
+ * so we need extra resource setup parsing our special DT properties encoding
+ * the MEM and IO apertures.
  */
 static int mvebu_pcie_parse_request_resources(struct mvebu_pcie *pcie)
 {
 	struct device *dev = &pcie->pdev->dev;
-	struct device_node *np = dev->of_node;
 	struct pci_host_bridge *bridge = pci_host_bridge_from_priv(pcie);
 	int ret;
 
-	/* Get the bus range */
-	ret = of_pci_parse_bus_range(np, &pcie->busn);
-	if (ret) {
-		dev_err(dev, "failed to parse bus-range property: %d\n", ret);
-		return ret;
-	}
-	pci_add_resource(&bridge->windows, &pcie->busn);
-
 	/* Get the PCIe memory aperture */
 	mvebu_mbus_get_pcie_mem_aperture(&pcie->mem);
 	if (resource_size(&pcie->mem) == 0) {
@@ -988,6 +979,9 @@  static int mvebu_pcie_parse_request_resources(struct mvebu_pcie *pcie)
 
 	pcie->mem.name = "PCI MEM";
 	pci_add_resource(&bridge->windows, &pcie->mem);
+	ret = devm_request_resource(dev, &iomem_resource, &pcie->mem);
+	if (ret)
+		return ret;
 
 	/* Get the PCIe IO aperture */
 	mvebu_mbus_get_pcie_io_aperture(&pcie->io);
@@ -1001,9 +995,12 @@  static int mvebu_pcie_parse_request_resources(struct mvebu_pcie *pcie)
 		pcie->realio.name = "PCI I/O";
 
 		pci_add_resource(&bridge->windows, &pcie->realio);
+		ret = devm_request_resource(dev, &ioport_resource, &pcie->realio);
+		if (ret)
+			return ret;
 	}
 
-	return devm_request_pci_bus_resources(dev, &bridge->windows);
+	return 0;
 }
 
 /*